Tamping-bar clamp



Dec. 14 1926. 1,610,990 l G. ALMQUlsT TAMPING BAR CLAMP Filed Janv. 2'7. 1926 3 Sheets-Sheet l Zbs INVENTK Av1-emma?v WITNESS:

Dec. v14 1926.

l G. ALMQUlIs-r TAMPING BAR CLAMP Filed Jan. 27, 192e 3 Sheet-Sheet 2 INVENTOR.

YTURNEY G. ALMQUIST TAMPING BAR CLAMP Filed Jan. 27, 1926 3 Sheets-Sheet 5 .fz f/ l/g Patented Das, 141%, 1925,

UNI T Elf) *STATE S GUS'YALM'QUIST, or Panels, CALIFORNIA.

TAMPING-BAR CLAMP.

Application mea Januaryenlszs. serial No. 84,191.

rlhis invention relates-to tampin'g devices employed for tampingdown the concrete or cement used in the filling of pipe molds and the like, and has for its objectthe provision of a novel clamp adapted to be mounted upon the tamping bar whereby to permit slippage as the material rises within the mold. the tamping element beingmoved upwardly automatically, the device being moreover'so constructed and arranged that when a mold is filled the tamping device may be released so that it will return to initial position ready for acting upon another mold.

An important object is the provision of a i device of this character provided with an easily operable handle for effecting the release. spring means being provided for hold ing the handle in a selected position.

in essential feature is the provision of a take-up device to compensate for the inevitable weer on the shoes so that adjustment may be made for insuring'proper operation regardlessof whether the shoesy be new and Lthick or old and thin.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, easy to install, positive in action, efficient and durable in service and a general improvement in the art.

lith the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which: Y

Figure 1 is a side elevation of a tamping apparatus associated witha mold and showing my device applied,

Figure 2 is an enlarged elevation of the device itself,

Figure 3 is a longitudinal section showing the handle in locked position,

Figure lV is a view similar to Figure 3 showing the handle in released position,

Figure 5 a detail. cross section on the line 5-5 of'Figure 3,

Figure Y6 is a view showing the adjusting means operated to permit continued yuse of old and thin shoes.

The remaining `figures are detail views.

Referring more particularly to thed'rawii'igs the letter A designates a conventional formv of tamp operating mechanism forv aplvind aower to a tam Bfor packin convP e l ,P v g These shoes are of some material crete or cement into a mold C such as a pipe mold or thelike. i

ln carrying out the present invention I provide` a peculiarly constructed clamp de vice which forms the operative connection betweenthe mechanism A and the tamp B for automatically permitting slippage as the material rises within the mold. This device comprises an elongated body designated broadly by the numeralv 1() and including a hollow portion or sleeve 11 through which the tamp B passes. This tamp is simply of bar formation with its lower end D widened to define a tamp head. The bodyr is formed at one side with a trunnion 12 for connection with a connecting rod E operated by the mechanism A. At its sides the body n is formedwith spaced parallel'ears 1-3- and between these earslthe front wall is formed with anVV opening 111.

Located within the sleeve portion 11 is a bowed spring member 15 lwhich has both ends 1'6 and'17 extended laterally overthe lower and upper ends respectively of the body. The end 17 is quite long and somewhat curved to constitute attaching means for a leaf spring 18 which is reduced in thickness'toward its free end and which is for a purpose to be described. Between this spring 15 and the tampingbar is alining or shoe 19 extending beyond the ends of the body, and between the opposite side of the sleeve portion and the other side of the tamping bar is a similar lining or shoe 20. which will exert considerable friction uponthe tamping bar when forced into engagementl therewith.

Located between the ears 13 is a camheacl 21 having an elongated slot 22 therein through which passes a pivot pin 23 engaged through the ears. This cam head is 4formed with an elongated bore 2a intersecting the slot 22 and havingone endthreaded for' eugagement therein Otthe'threaded end of a control handle25 securedby a lock nut V26 or its equivalent. The cani head is further 'formed with alsocket 27 intersecting the'slot 2,2 and containing a c oil spring28 which bears against the'pin23`agnd against aclosiire plug 29 "screwed vinto the outer4V end of the socket'. y The purpose of this spring is to hold the parts in such'rposition thatth'e'pin 23 wuill'bev at, one eiidof'the slot 22.

Thecam 'head is 'providedforl cooperation with the spring 15, and has its heel portion termed With a slot 30 Within which is journaled a roller 31 adapted to bear against the outer side oi' the spring 15 at its center for effecting compression thereof.

A very important ,leaturewis the provision of a. block orV plunger Xvhichiis slidably.

v f gaged bythe handle Thenpper endnih, this bloclr is cut away at an incline to define mounted Within the bore 124i and Which is ena. Wedging surface bearing against the pin ln the operation, it will be apparent that when the handle is swung downwardly to its when the mechannnn is operated to exert a tamping action on material in the mold, the tamping bar B may slide upwardly With respect to the body member 10, slippage 'M' occurring betiveen tl e shoes 19 and 20 and the "Q the handle a5 and swings it into the position shown in Figure l whereupon the roller 31 moves away from the spring 15 and releases the tension thereof upon the friction shoes and tamping bar so that the bar gravitationally descends to normal or initial position ready tor a second cycle of operations.

llllhen in the.course-oi"A time the shoes 19 and 2O become Worn and thin as indicated in Figure 6, it is merely necessary to loosen the nut 26 and turn the handle 25 in a clockwise direction so as to slide the plunger or block 82 upwardly along the bore 211. When this is done the Wedging surface 33 engaging the pin 23, Will move the cam head 21 laterally with respect to andtoivard the tamping bar so that the spring 15 may still exert a proper compressing action on the friction shoes. rlhe purpose of the spring 28 is to take up any back-lash or lost motion Which might inter-tere with the proper action.

From the 'foregoing description and a. study ot the drawings'it will be apparent lirr'struoted, inexpensive and easily -controlled and ,used clamping device for tamping barks which will eliiciently perform all the functions or which it is intended and which on Lclaim:

1. In a device of, the character Y.Clesclibed, a l)ody.inein.ber l. a power l 'camping mechanism and formed adantedlorconnection with Y. Y. Y

Awith a sleeve portion, a tamping bar slidableVUV through said sleeve portion, friction lmeans within the sleeve portion for engagement with the tamping bar, meansv tor applying tension toiiliei'm'eans" ttor VVVpermitting limiti ed slippage o'l the tamping bar comprising a bowed spring located Within the sleeve portion, a cam lever having a Vhead pivoted with respect to the sleeve portion, the cam head carrying a roller at its heel portion engageable With the spring 'for' compressing the same, and a leaf spring carried by the sleeve portion and engageable with the cam lever for maintainingI the same in a selected position.

2. ln a device ot the character described, a body member adapted for connection with Aa power t'amping device and formed With a sleeve portion, a tamping bar slidable through said sleeve portion, friction produce ing means Within the sleeve portion engaging the tamping bar, means for applying tension to said means for permitting limited slippage ot the tamping bar comprising a spring located Within the sleeve portion, aV cam lever having a head portion formed with an elongated slot, a pivot carried by the sleeve portion and passing through said slot, spring means within the head of the cam engaging the pivot, and means for shifting the cam head with respect to its pivot Yfor varying the spring tension.

ln a device of the characterdescribed, abody member adapted for connection with a power tamping device and formed with a sleeve portion, a tamping bar :slidable through said sleeve portion, friction producing means Within the sleeve portion engaging the tamping bar, means for applying tension to said means for permitting limited slippage oi' the tamping bar comprisinga spring located Within the sleeve portion, a

cam lever having ahead y, portion VVformed *Y elongated slot, a pivot carried by the sleeve portion and passing through said slot, spring means Withinr the head of the cam engaging the pivot, and means i'or shifting the cam headwvith respect to its pivot, for varying.the'spring tension, oomprising .a longitudinally screw operated `wedge member located Within-the cam lever and -engageable With the pivot of the cam.

in a device oi the character described,

a body member adapted for connection With a power tamping `mechanism and formed with :i sleeve portion, s jtziniping bar slid- :ible fithin said sleeve portion, friction shoes Within the sleeve portion for engage- Aieiit with the tamping ber, means for applying tension to the slices for permitting limited slippage of the tsmping bar, said means 'comprising e springlocated Within the sleeve portion, 2L pivoted cem memberl engzio'enble with said spring, and ineens for miljiist-ing the cam for varying the spring tension. Y

n e device of the character described, :i body he fing a sleeve portion, friction shoes Withinl the sleeve poruion, :i tamping bar slidiible through the sleeve porti n between seid shoes, a, bowed spring member Within the sleeve portion, ii cam heed pivoted on thebody and having ii heel engegeable With the springtoi' compressing the seme and the iciiction shoes, and Wedge ineens tor shitting the pivot of the cam.

(if, n ey device o'f the character described, o. body having zi sleeve portion, 'friction slices Within the sleeve portion, :i tamping bar slidzible through the sleeve portion between seid shoes, e bowed spring member within the sleeve portion, e com heed pivot ed on the body and having e heel engageable with the spring for compressing the same and the friction shoes, and means 'for shifting said pivot point to vary the position of the cam heed with respect to the spring.

the lirictioii shoes, means Jfor shifting seidv pivot point to vary the position of the heed with respect to the spring, comprising a Wedge element engaging the pivot land loceted Withinv the com heed, and means for moving seid Wedge element.

8. n e device of the character described, at body having a sleeve portion, friction shoes Within the sleeve portion, a taniping ber slidziblel through 'the sleeve portion between seid shoes, a bowed spring member Within the sleeve portion, a cam head pivoted on the body and having a heel engageebleivitli the spring for compressing the seme and the friction shoes, ineens for shifting said pivot point to vary the position of the cam head With respect to the spring, comprising e Wedge element engaging the pivot and located Within the cam head, means for moving said Wedge element, a handle screwed into the cam head and engaging seid Wedge member for controlling the position thereof.

In testimony whereof eiiX my signature.

GUS ALMQUIST.

CII 

